Display screen or portion thereof with transitional computer graphical user interface



The patent or application file contains at least one drawing executed in color. Copies of this patent or patent application publication with color drawing(s) will be provided by the Office upon request and payment of the necessary fee.

FIG. 1 is a front view of a first embodiment of a display screen or portion thereof with transitional computer graphical user interface according to the claimed design; and,

FIG. 2 is a second image thereof.

The appearance of the transition is sequential from FIG. 1 to FIG. 2. The process or period in which an image transitions to another image forms no part of the claimed design.

The grey shading in the rectangle which contains the broken-line arrow in FIGS. 1 and 2 depicts a contrast in appearance.

The outermost long-dashed broken lines illustrate an electronic device, which constitutes the environment of the design and forms no part of the claim. The intermediate-length dashed broken line illustrates a display screen and the boundary of the design and forms no part of the claim. The remaining short-dashed broken lines illustrate portions of the graphical user interface that form no part of the claimed design. 

CLAIM The ornamental design for a display screen or portion thereof with transitional computer graphical user interface, as shown and described. 